CANOGA PERKINS 2240 Fiber Optic Modem - Manual (Page 100)

100
Canoga Perkins
Table 6-A.
Link Loss Range
6.3 Fiber Optic Diagnostic Procedure
If the Loopback Test is successful, and the modems still do not function, check the
fiber optic parameters as outlined below. There also may be a data rate incompat-
ibility. If this check out of the electrical and optical links provides no indication as
to the problem, contact Canoga Perkins Installation and Repair Department for as-
sistance.
NOTE: Each range limit has a +1dB margin at the transition point.
The following are some additional checkpoints to consider:
•••••
Fiber optics.
•••••
Are you using a fiber optic link of less than the High Power Loss
Budget? (refer to Table 6-A)
Set the optical power switch to LO.
•••••
Are you using a fiber optic link of more than the Low Power Loss
Budget?(refer to Table 6-A)
Set the optical power switch to HI.
•••••
Are the fiber optic cables marked correctly?
Connect Tx cable to Tx connector, Rx to the Rx connector.
If Local and Remote Sync indicators do not come on, try swapping cables
at one end of link.
•••••
Is the data rate set correctly?
•••••
Are you using the correct clock mode (internal/external) for
synchronous transmission or are you using asynchronous
transmission?
NOTE: The 1310 nm LP Laser does not have a HI/LO power switch.
Link Loss Range
Model HI Power LO Power
850 nm Standard >6 dB to Max <6 dB
1310 nm HP Laser >6 dB to Max <6 dB
1550 nm HP Laser >6 dB to Max <6 dB
1310 nm LP Laser – –